c# -access update komutu sorunu

OleDbDataAdapter ad = new OleDbDataAdapter("UPDATE ListeTBL set Bolge='" + comboBoxBolge.Text + "',Aciklama='" + textBoxAciklama.Text + "',Urun='" + comboBoxUrun.Text + "',Tutar='" + textBoxTutar.Text + "' where AdSoyad='" + textBoxAdSoyad.Text + "'", bag); 

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) 
  { 
   
   
  textBoxNo.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString(); }